CN106299718B - A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material - Google Patents
A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material Download PDFInfo
- Publication number
- CN106299718B CN106299718B CN201611004400.5A CN201611004400A CN106299718B CN 106299718 B CN106299718 B CN 106299718B CN 201611004400 A CN201611004400 A CN 201611004400A CN 106299718 B CN106299718 B CN 106299718B
- Authority
- CN
- China
- Prior art keywords
- dielectric material
- medium substrate
- substrate
- polarization
- medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q15/00—Devices for reflection, refraction, diffraction or polarisation of waves radiated from an antenna, e.g. quasi-optical devices
- H01Q15/0006—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices
- H01Q15/0086—Devices acting selectively as reflecting surface, as diffracting or as refracting device, e.g. frequency filtering or angular spatial filtering devices said selective devices having materials with a synthesized negative refractive index, e.g. metamaterials or left-handed materials
Landscapes
- Aerials With Secondary Devices (AREA)
- Constitution Of High-Frequency Heating (AREA)
Abstract
The invention discloses a kind of, and the polarization based on dielectric material rotates super surface, metal substrate including lower layer is located at the medium substrate on surface layer at least one, medium substrate is evenly arranged into planar array and is set on metal substrate, the rounded band gap structure of medium substrate, notch on medium substrate is 1/4 circumferential notch, and medium substrate is pasted on metal substrate.The present invention is to overcome the limitation on the super surface based on metal structure, the present invention is designed using dielectric material, the characteristics of dielectric material can be given full play to, make up the deficiency of metal structure, polarization provided by the invention simultaneously based on dielectric material rotates super surface, can generate polarization conversion characteristic to incident electromagnetic wave.
Description
Technical field
The invention belongs to super surface design fields, and it is super to more particularly relate to a kind of polarization rotation based on dielectric material
Surface and preparation method thereof.
Background technique
Super surface (Metasurface) is the periodic surface for having regulating and controlling effect to electromagnetic wave, can be by electromagnetic wave
The parameters such as amplitude, phase regulation, change the transmission characteristic of electromagnetic wave.The abnormality to electromagnetic wave may be implemented using super surface
Reflection, anomalous transmission, polarization rotation, the functions such as plate focusing.In general, typical super surface is based on Metal Structure Design
, though metal structure has many advantages, such as, inoxidizability, corrosion-resistant, high temperature resistant and in terms of have it is certain
Limitation.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, it is an object of the present invention to provide a kind of super table of polarization rotation based on dielectric material
Face and preparation method thereof carries out Structured Design to it, electromagnetic wave is enabled to make by introducing high-k dielectric materials
With thereon when generate polarization rotation.
The invention is realized in this way a kind of polarization based on dielectric material rotates super surface, the Metal Substrate including lower layer
Plate is located at the medium substrate on surface layer at least one, and the medium substrate is evenly arranged into planar array and is set to the Metal Substrate
On plate, the rounded band gap structure of medium substrate, the notch on the medium substrate is 1/4 circumferential notch, is given an account of
Matter substrate sticking is on the metal substrate.
The features of the present invention also characterized in that the medium substrate is made of dielectric material.
The features of the present invention also characterized in that the metal substrate is copper sheet.
The features of the present invention also characterized in that dielectric material used is microwave dielectric ceramic.
The features of the present invention also characterized in that the dielectric constant of microwave dielectric ceramic between 1-1000, is lost in 0.0001-
Between 0.1.
The features of the present invention also characterized in that the geometric parameter requirement of the medium substrate is as follows:
1mm≤R≤5cm, 0.2mm≤d≤8cm；
Wherein R is expressed as the radius of medium substrate, and d is expressed as the thickness of medium substrate；
Horizontal spacing a and longitudinal pitch b between medium substrate and adjacent media substrate meet 1mm≤a=b≤10cm.
The present invention also provides above-mentioned, and the polarization based on dielectric material rotates the production method on super surface, production method
It is: medium substrate is pasted on metal substrate in a manner of being evenly arranged into planar array glue.
Compared with the existing technology, the invention has the following beneficial effects:
The present invention is to overcome the limitation on the super surface based on metal structure, is designed to dielectric material, can be abundant
The characteristics of playing dielectric material makes up the deficiency of metal structure, while the polarization rotation provided by the invention based on dielectric material
Super surface can generate polarization conversion characteristic to incident electromagnetic wave.
Detailed description of the invention
Fig. 1 is that the present invention is based on the structural schematic diagrams that the polarization of dielectric material rotates super surface；
Fig. 2 is the emulation S parameter figure that 1 medium dielectric constant microwave medium of the embodiment of the present invention is 110；
Fig. 3 is the theory analysis figure of the embodiment of the present invention 1；
Same polarization reflectance magnitude and same polarization reflected phase when Fig. 4 is simulation calculation u, v polarized wave vertical incidence
Result figure；
Same polarization reflected phase difference result figure when v, u polarized wave vertical incidence that Fig. 5 obtains for simulation calculation；
Fig. 6 is the emulation S parameter figure that 2 medium dielectric constant microwave medium of the embodiment of the present invention is 85；
Fig. 7 is the emulation S parameter figure that 3 medium dielectric constant microwave medium of the embodiment of the present invention is 300.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
A kind of polarization based on dielectric material provided in an embodiment of the present invention rotates super surface, as shown in Figure 1, including lower layer
Metal substrate and at least one be located at the medium substrate on surface layer, medium substrate is evenly arranged into planar array and is set to Metal Substrate
On plate, the rounded band gap structure of medium substrate, the notch on medium substrate is 1/4 circumferential notch, and medium substrate is pasted on
On metal substrate.
Above-mentioned medium substrate is made of dielectric material, and metal substrate is copper sheet, and dielectric material used is micro-wave dielectric pottery
Porcelain, the dielectric constant of microwave dielectric ceramic are lost between 0.0001-0.1 between 1-1000.
The geometric parameter of medium substrate requires as follows:
1mm≤R≤5cm, 0.2mm≤d≤8cm；
Wherein R is expressed as the radius of medium substrate, and d is expressed as the thickness of medium substrate；
Horizontal spacing a and longitudinal pitch b between medium substrate and adjacent media substrate meet 1mm≤a=b≤10cm.
The embodiment of the invention also provides above-mentioned, and the polarization based on dielectric material rotates the production method on super surface, production
Method is: medium substrate is pasted on metal substrate in a manner of being evenly arranged into planar array glue.
The polarization of researching and designing of the present invention rotates super surface, is set to gold using the rounded medium substrate with gap structure
Belong on substrate, can make to rotate super surface and show as high impedance surface along one axis, and shows as metal on another quadrature axis
Reflecting surface, the reflected wave component in two axial directions obtain 180 ° of phase differences.When incident line polarization wave polarization direction is to rotation table
When face symmetry axis is at 45 °, back wave polarization direction is rotated by 90 °.Polarization revolving property is generated to incident electromagnetic wave to realize.
Technical solution of the present invention is described in more detail combined with specific embodiments below.
Embodiment 1
The present embodiment uses circular strip notch asymmetric dielectric structured media substrate, and medium substrate uses dielectric material system
At specifically, dielectric material used is microwave ceramics.Ceramic system for used raw material include Carbon Dioxide barium, magnesia,
Carbon Dioxide strontium, titanium dioxide, lanthana, stoichiometric ratio 0.7Ba0.6Sr0.4TiO3--0.3La(Mg0.5Ti0.5)O3.It will
Microwave ceramics is prepared into circular strip notch unsymmetric structure, and then periodic arrangement forms the super table of polarization rotation on metallic substrates
Face.The structure has the dielectric resonance characteristic in specific microwave frequency band, so that polarization of ele changes.In each resonance frequency
Rate, surface of revolution shows as high impedance surface along one axis, and metal reflective surface is shown as on another quadrature axis, two axis
Upward reflected wave component obtains 180 ° of phase differences.When incident line polarization wave polarization direction is at 45 ° to surface of revolution symmetry axis,
Back wave polarization direction is rotated by 90 °.The achievable transfer efficiency of this example is 90% or more.
The specific preparation process of the present embodiment are as follows:
(1) what this example used uses dielectric material for ceramic material, chemical formula 0.7Ba0.6Sr0.4TiO3--0.3La
(Mg0.5Ti0.5)O3.Specific preparation process is as follows: raw material is in dehydrated alcohol with ZrO2Ball is medium planetary ball mill 24 hours, is dried
Dry grinding obtains dry powder.By gained Carbon Dioxide barium, Carbon Dioxide strontium, titanium dioxide powder, pre-burning 2 is small in 1200 DEG C of air
Shi Baowen 2 hours, titanium dioxide, magnesia, lanthana preburning powdered material kept the temperature 2 hours in pre-burning 2 hours in 1400 DEG C of air, will
Obtained two kinds of powders sieving drying.By analytically pure Carbon Dioxide barium, Carbon Dioxide strontium, titanium dioxide, magnesia, lanthana
It is dried 10 hours under the conditions of being placed in 150 DEG C, is stoichiometrically 0.7Ba0.6Sr0.4TiO3--0.3La(Mg0.5Ti0.5)O3Match
Material.Two kinds of powders are carried out after being mixed and dried mixed material in dehydrated alcohol for planetary ball mill 12 hours again with the ratio of 7:3
Polyvinyl alcohol hand lapping is added and is granulated (100 mesh), ceramic powder is made.
(2) ceramic powder is added among the cylindrical die that internal diameter is 10mm, utilizes press dry-pressing under a certain pressure
Molding prepares cylindrical ceramic green compact, obtains ceramic of compact by sintering.
(3) using vector network analyzer and the relative dielectric constant of resonant cavity test macro measurement cylindrical ceramic.It is right
In the ceramics that this example uses, relative dielectric constant 110, being lost is 0.0015.
(4) using electromagnetic simulation softwares such as CST, in conjunction with the electromagnetic parameter progress structure for the dielectric material that above-mentioned steps determine
Design and simulation calculation carry out the optimization of planform and geometric parameter on this basis.
(5) special shape ceramic mold is prepared using mould steel, it can be for circular strip notch asymmetrical shape or other are special
Shape, concrete shape are provided by simulation optimization.Ceramic powder is added among mold, press dry-pressing under a certain pressure is utilized
Molding prepares ceramic green.Green body is to slowly warm up to 550 DEG C in air, 2 hours exclusion PVA is kept the temperature, then green body exists
Heat preservation sintering 4 hours, obtains ceramic of compact in 1500 DEG C of air.
(6) using mechanical equipments such as cutting machine, polishing machines by the obtained asymmetric Ceramic manufacturing of circular strip notch of sintering extremely
Given thickness.And periodic arrangement forms the super surface of polarization rotation on metallic substrates.
(7) super surface is rotated to polarization using vector network analyzer and Free-space measurement system and carries out electromagnetic performance survey
Examination.
Work as a=b=10mm, when R=3mm, d=8mm, is emulated, obtained with CST Microwave Studio software
S parameter it is as shown in Figure 2.Figure it is seen that the effect of polarization rotation has occurred in incident electromagnetic wave, working frequency range is big
About in 3.68-4.64GHz and 5.08-5.12GHz.
It is illustrated in figure 3 its schematic illustration for realizing cross polarization reflection, it is assumed that incident line polarization wave is x polarized wave,
The electric field of incidence wave is Ei,Uov coordinate system is established on direction, and as shown in phantom in Figure 3, incident electric fields are decomposed
To the direction u, v, i.e.,Polarization conversion structural unit round for notch in Fig. 3, u, v polarized wave vertical incidence
When efficient same polarization reflection can be achieved, i.e. same polarization reflection ruu and rvv is approximately equal to 1.And phase is reflected for same polarization
Position, when u, v polarized wave incidence, a kind of notch circle in the structural unit situation under incident electric fields effect is comparable to no response,
Incidence wave is reflected by metal backing, and because metal backing can regard PEC as, polarization back wave generates π phase shift.Another situation polarized wave
When incident, structure generates resonance, phase shift zero under incident electric fields effect, and cellular construction can regard PMC as.Therefore, two kinds of polarization
Cellular construction when wave vertical incidence can be equivalent to PEC, PMC respectively, generate π and 0 phase shift respectively.Incident electric fields v component in figure
π phase shift, i.e. Erv=-Eiv are generated after " PEC " reflection, u component generates 0 phase shift, i.e. Eru=Eiu after " PMC " reflection, because
This back wave is y polarized wave.
It is set on metal substrate using the rounded medium substrate with gap structure, can make to rotate super surface along one
A axis shows as high impedance surface, and metal reflective surface is shown as on another quadrature axis, the reflected wave component in two axial directions
Obtain 180 ° of phase differences.When incident line polarization wave polarization direction is at 45 ° to surface of revolution symmetry axis, back wave polarization direction quilt
It is rotated by 90 °.Polarization revolving property is generated to incident electromagnetic wave to realize.This is the mechanism for generating polarization rotation.
To verify analysis above, same polarization reflectance magnitude when simulation calculation u, v polarized wave vertical incidence is distinguished
With same polarization reflected phase, Fig. 4 is simulation result, wherein (a) is same polarization reflectance magnitude, (b) reflects phase for same polarization
Position.As can be seen from Figure 4: the same polarization in the wideband frequency range of operating frequency range, when u, v polarized wave vertical incidence
Reflectance magnitude is very high.Fig. 5 show same polarization reflected phase when v, u polarized wave vertical incidence that simulation calculation obtains
DifferenceDotted line is 180 ° of phase differences in Fig. 5.As can be seen from Figure 5: in the frequency range of polarization conversion work,
U, same polarization reflected phase when v polarized wave vertical incidence is poorIt is oscillated about at 180 °.In frequency f=3.83,
Phase difference at 4.26,4.62 and 5.1GHz
Embodiment 2
Ceramic formula is changed to 0.6Ba0.6Sr0.4TiO3-0.4La(Mg0.5Ti0.5)O3, change sintering temperature and other
Part, the ceramic dielectric constant prepared are 85, loss about 0.002.At this point, still using circumferential notch structure.By its parameter
It is changed to a=b=8.8mm, R=2.5mm, d=7mm. continues to use CST Microwave Studio software and emulated, obtained
S parameter it is as shown in Figure 6.It can be seen that having polarization rotates effe well in 5.09-6.2GHz and 6.84-6.9GHz.
Embodiment 3
Ceramic formula is changed to SrTiO3, sintering temperature and other conditions are changed, the ceramic dielectric constant prepared is 300
Left and right.At this point, still using circumferential notch structure.Its parameter is changed to a=b=5mm, R=2mm, d=6mm. is continued to use
CST Microwave Studio software is emulated, and obtained S parameter is as shown in Figure 7.It can be seen that in 3.07-3.93GHz
There is polarization rotates effe well with 4.42-4.45GHz.
Although preferred embodiments of the present invention have been described, it is created once a person skilled in the art knows basic
Property concept, then additional changes and modifications may be made to these embodiments.So it includes excellent that the following claims are intended to be interpreted as
It selects embodiment and falls into all change and modification of the scope of the invention.
Obviously, various changes and modifications can be made to the invention without departing from essence of the invention by those skilled in the art
Mind and range.In this way, if these modifications and changes of the present invention belongs to the range of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to include these modifications and variations.
Claims (7)
1. a kind of polarization based on dielectric material rotates Meta Materials, which is characterized in that the metal substrate including lower layer and at least one
A medium substrate positioned at surface layer, the medium substrate are evenly arranged into planar array and are set on the metal substrate, institute
The rounded band gap structure of medium substrate is stated, the notch on the medium substrate is 1/4 circumferential notch, and the medium substrate is pasted
In on the metal substrate.
2. a kind of polarization based on dielectric material as described in claim 1 rotates Meta Materials, which is characterized in that the medium base
Plate is made of dielectric material.
3. a kind of polarization based on dielectric material as described in claim 1 rotates Meta Materials, which is characterized in that the Metal Substrate
Plate is copper sheet.
4. a kind of polarization based on dielectric material as claimed in claim 2 rotates Meta Materials, which is characterized in that dielectric material used
Material is microwave dielectric ceramic.
5. a kind of polarization based on dielectric material as claimed in claim 4 rotates Meta Materials, which is characterized in that micro-wave dielectric pottery
The dielectric constant of porcelain is lost between 0.0001-0.1 between 1-1000.
6. a kind of polarization based on dielectric material as described in claim 1 rotates Meta Materials, which is characterized in that the medium base
The geometric parameter of plate requires as follows:
1mm≤R≤5cm, 0.2mm≤d≤8cm；
Wherein R is expressed as the radius of medium substrate, and d is expressed as the thickness of medium substrate；
Horizontal spacing a and longitudinal pitch b between medium substrate and adjacent media substrate meet 1mm≤a=b≤10cm.
7. the production method of the polarization rotation Meta Materials based on dielectric material as described in claim 1-6 is any, feature exist
In medium substrate is pasted on metal substrate in a manner of being evenly arranged into planar array glue.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611004400.5A CN106299718B (en) | 2016-11-15 | 2016-11-15 | A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611004400.5A CN106299718B (en) | 2016-11-15 | 2016-11-15 | A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106299718A CN106299718A (en) | 2017-01-04 |
| CN106299718B true CN106299718B (en) | 2019-04-19 |
Family
ID=57721103
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611004400.5A Expired - Fee Related CN106299718B (en) | 2016-11-15 | 2016-11-15 | A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106299718B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107257030B (en) * | 2017-06-30 | 2020-03-24 | 南京航空航天大学 | Broadband linear-circular polarization converter based on 2.5-dimensional band-pass frequency selection surface |
| CN107994353B (en) * | 2018-01-10 | 2023-12-29 | 中国计量大学 | Broadband metamaterial terahertz wave absorber |
| CN108511918B (en) * | 2018-03-13 | 2020-08-28 | 东北石油大学 | Electromagnetic wave asymmetric transmission controller based on metamaterial |
| CN108336502B (en) * | 2018-04-09 | 2020-10-02 | 南京邮电大学 | All-dielectric reflection type dual-band polarization converter of ship anchor structure |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105161858A (en) * | 2015-10-10 | 2015-12-16 | 复旦大学 | Circularly-polarized tuning modulator based on tunable metasurface and design method thereof |
| CN105206904A (en) * | 2015-09-25 | 2015-12-30 | 中国人民解放军空军工程大学 | Double-passband frequency selective surface based on high-dielectric low-loss all-dielectric metamaterial |
| CN105272216A (en) * | 2015-10-13 | 2016-01-27 | 中国人民解放军空军工程大学 | Design method of reconfigurable metamaterial-based all-dielectric FSS (frequency selective surface) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2594971A1 (en) * | 2010-07-15 | 2013-05-22 | Asahi Glass Company, Limited | Process for producing metamaterial, and metamaterial |
| US20140085693A1 (en) * | 2012-09-26 | 2014-03-27 | Northeastern University | Metasurface nanoantennas for light processing |
-
2016
- 2016-11-15 CN CN201611004400.5A patent/CN106299718B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105206904A (en) * | 2015-09-25 | 2015-12-30 | 中国人民解放军空军工程大学 | Double-passband frequency selective surface based on high-dielectric low-loss all-dielectric metamaterial |
| CN105161858A (en) * | 2015-10-10 | 2015-12-16 | 复旦大学 | Circularly-polarized tuning modulator based on tunable metasurface and design method thereof |
| CN105272216A (en) * | 2015-10-13 | 2016-01-27 | 中国人民解放军空军工程大学 | Design method of reconfigurable metamaterial-based all-dielectric FSS (frequency selective surface) |
Non-Patent Citations (2)
| Title |
|---|
| "Ultrawideband and High-Efficiency Linear Polarization Converter Based on Double V-Shaped Metasurface";Xi Gao;《IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》;20150831;全文 |
| "基于开口椭圆环的高效超宽带极化旋转超表面";余积宝;《物理学报》;20150930;全文 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106299718A (en) | 2017-01-04 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106299718B (en) | A kind of polarization rotation Meta Materials and preparation method thereof based on dielectric material | |
| CN100434392C (en) | Ba1-xSrxTiO3-Mg2TiO4 two-phase composite ceramic material and its preparing process | |
| JPH10223045A (en) | Manufacture of voltage change dielectric synchronizing ferroelectric ceramic polymer composite material | |
| CN105000877A (en) | High-quality-factor temperature-stabilization type microwave dielectric material and preparation method thereof | |
| CN107235711B (en) | Temperature-stable metaantimmonic acid magnesium lithium-based microwave medium composite ceramics and preparation method thereof | |
| CN109180181A (en) | A kind of unleaded relaxation antiferroelectric ceramics energy storage material and preparation method thereof | |
| CN110183227A (en) | A kind of Li2MoO4-Mg2SiO4Base composite ceramic microwave material and preparation method thereof | |
| CN109928753A (en) | A kind of low-k silicon substrate microwave dielectric ceramic materials and preparation method thereof | |
| CN104987070A (en) | Temperature stable microwave dielectric ceramic with medium dielectric constant and preparation method of temperature stable microwave dielectric ceramic | |
| CN103864426A (en) | Medium-sintering temperature stable microwave dielectric ceramic material | |
| CN105272218B (en) | A kind of intermediate sintering temperature high-dielectric-constant ceramics dielectric material for capacitor | |
| CN104817322B (en) | A kind of temperature-stable capacitor ceramic material Sr4euTiNb9o30and preparation method thereof | |
| CN110229004A (en) | A kind of low-temperature sintered microwave dielectric ceramic material and preparation method thereof | |
| CN101654367B (en) | Low temperature reaction sintering method of lithium niobium titanium microwave dielectric ceramic materials | |
| CN108727023A (en) | A kind of molybdic acid aluminium base microwave-medium composite ceramics and preparation method thereof | |
| CN105060878A (en) | Microwave dielectric ceramic with low dielectric constant and high quality factor and preparation method thereof | |
| CN108863349A (en) | A kind of barium titanate-based lead-free height Jie temperature-stable ceramic material and preparation method thereof | |
| CN102295457B (en) | Low-loss Sm2O3-TiO2 microwave medium ceramic and preparation method thereof | |
| CN104987071A (en) | Low-temperature sintered microwave dielectric ceramic material with middle permittivity | |
| CN103360070B (en) | A kind of based on ceramic substrate metamaterial and preparation method | |
| CN103864416A (en) | Method for preparing barium titanate ceramic capacitor medium at low sintering temperature | |
| CN110698199A (en) | Low-loss microwave dielectric ceramic prepared by adopting step-by-step pre-firing method | |
| CN106220174A (en) | A kind of intermediate sintering temperature middle-dielectric constant microwave-medium ceramic material and preparation method thereof | |
| CN106278258A (en) | A kind of MLCC high dielectric constant ceramic material and preparation method thereof | |
| CN105060892A (en) | Composite tantalate microwave dielectric ceramic with near-zero frequency temperature coefficient |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20190419 Termination date: 20211115 |